Small Metal Finder (T1320E)

This circuit was found in a Radio Craft from September 1948. It uses two tubes, has a high impedance headphone output, and is powered by batteries.

Touch Activated Motor II (CB1548E)
The simple touch of the fingers on a sensor causes this circuit to drive a motor that goes into...
Audio Controlled Lamp (CB5988E)
This circuit is better than the previous one in that the control is isolated by a transformer. The...
Silicon Labs' Low-Power Plug-and-Play WGM110 Wi-Fi Module for IoT Applications
March 21, 2016 - Mouser Electronics, Inc. is now stocking the WGM110 Wizard Gecko Wi-Fi module...